battery powered gps tracker introduction and application industry from yilian's blog

battery powered gps tracker is A GPS signal receiver. It receives and demodulated satellite broadcast C/A code signals like a "radio", but does not send signals, which belongs to passive positioning.

The battery powered gps tracker calculates the pseudo distance between the received information and each satellite, and uses the range rendezvous method to calculate the four parameters of the receiver: longitude, latitude, altitude and time correction. It is characterized by fast point speed but large error. The module of initial positioning requires at least 4 satellites to participate in the calculation, which is called 3D positioning, and 3 satellites can realize 2D positioning, but the accuracy is not good. battery powered gps tracker continuously outputs location information and auxiliary information in NMEA format through a serial communication port for the receiver to select and apply.

Factors affecting the accuracy of battery powered gps tracker

The positioning accuracy of battery powered gps tracker depends on many aspects, such as satellite clock and orbit differences from the GPS system, the number and geometric distribution of visible GPS satellites, solar radiation, atmosphere, multipath effect, etc. In addition, the same battery powered gps tracker will also have different positioning errors due to antenna and feeder quality, antenna position and direction, test period, open sky range and direction, weather, PCB design, etc. Even if different battery powered gps trackers of the same manufacturer and model are tested with antenna diversity at the same time, the static drift will be different.

battery powered gps tracker positioning principle

Ground coordinates and their general geographical elements (i.e., rendezvous behind space) are obtained roughly by measuring the distance of a satellite in orbit (which determines that it is a known piece of data) from a ground point. Because the quantities of position in the solution equation are XYZ and the clock difference T, the number of accepted satellites must be greater than or equal to 4.

In the process of positioning, there are two ways to obtain the pseudo-distance from the satellite to the ground (i.e. the distance containing error) : 1, ranging code; 2. Carrier phase.

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